<template>
  <div id="app">
    <div>
      <span >姓名:</span>
      <input type="text" v-model.trim="name"/>
    </div>
    <div>
      <span>年龄:</span>
      <input type="number"  v-model.number="age"/>
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item,index) in arr" :key="index">
          <td>{{index+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.gender}}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      
        arr: [
        { name: "张三", age: 18, gender: "男" },
        { name: "李四", age: 19, gender: "男" },
        { name: "王五", age: 20, gender: "女" },
        { name: "赵六", age: 26, gender: "男" },
      ],
      name : '',
      age: '',
      gender:'男',
      isChange:-1
    }
  },
  methods : {
    del(index) {
    
      this.arr.splice(index,1)
    },
    edit(index) {
    this.name=  this.arr[index].name
    this.age=  this.arr[index].age
    this.gender=  this.arr[index].gender
    this.isChange = index
    },
    add() {
      if(this.isChange===-1) {
      const obj = {
        name:this.name,
        age: this.age, 
        gender: this.gender 
      }
      this.arr.push(obj)
      }else{
      this.arr[this.isChange].name=this.name
      this.arr[this.isChange].age=this.age
      this.arr[this.isChange].gender=this.gender
      this.isChange = -1
      }
     this.name =''
     this.age =''
     this.gender =''
    }
   
  }
}
</script>
